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LaserJet 1000 streaking

I have a LaserJet 1000 that leave a vertical streak on all pages. I have tryed another brand new toner and the problem persist. Also, the page is a little bit crushed where it leave the mark, i'm not sure where it could come from ? I wonder what should I look for if I open the printer to repair it. I attached a file showing the problem.

The toner cartridge is bad. In those models, the photo drum is inside the cartridge. When the photo drum rotates through the toner and picks up particles where it's been written on and deposits it unto the page. further rotation, a blade cleans off the toner left behind and it collects in a bin, sometimes reused. If the blade is damaged or the little hopper for the excess is full, the results is what you see, remnants from the previous pages, deposited and fused to the paper. If I remember right, it takes almost three rotations of the photo drum for one page, so you'd see a repeating image twice a page. I have seen images burned unto a drum from a user doing blank calendar pages, hundreds of them.